Method and tool for neutron lifetime logging

Details Method and tool for neutron lifetime logging Method and tool for neutron lifetime logging

G - Physics

01

V

358/4

G01V 5/10 (2006.01)

Patent

CA 1253634

F-3470-L METHOD AND TOOL FOR NEUTRON LIFETIME LOGGING ABSTRACT A borehole logging tool for neutron lifetime logging of subterranean formations surrounding a borehole includes a pulsed source of fast neutrons and a radiation detector for measuring neutrons returning to the borehole from the irradiated formations surrounding the borehole. The radiation detector system comprises a neutron absorbing and gamma ray radiating material which is moved by an articulating arm into contact with the borehole wall and is azimuthally oriented so that such neutron adsorbing and gamma ray radiating material is firmly pressed against the formation. A shielding material minimizes absorption of neutrons from the borehole fluid. A gamma ray detector located in the main body of the logging tool detects gamma rays from the radiating material as a measure of the epithermal or thermal lifetime characteristic of the formation adjacent the borehole.

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